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46 条记录 (耗时 0.012 秒)

    1.
    发明授权
    失效

    公开(公告)号：US4128357B1

    公开(公告)日：1984-07-17

    申请号：US88225078

    申请日：1978-02-28

    IPC分类号： B28B3/02 ,  E01C5/00 ,  E02B3/14 ,  H03B7/04

    CPC分类号： E01C5/00 ,  B28B3/021 ,  E01C2201/06 ,  E01C2201/16 ,  E02B3/14 ,  H03B7/04 ,  Y02A30/68

    摘要： A slab element for covering the ground is made e.g. of concrete and forms as a single piece. It has a head portion and a stem portion meeting at a notional meeting surface. The element is delimited by two opposite end faces of equal length joined by sides that form angled traces about a longitudinal axis common to the head at the stem, each said angled trace being formed by a succession of sides comprising at said head an inclined side face inclined in one direction relatively to the axis, a lateral side face extending lengthwise with respect to the axis and another inclined side face inclined in the opposite direction with respect to the axis, and comprising at the stem a lateral side face extending lengthwise with respect to the axis which is complementary to the lateral face of the head, the end face of the head together with its inclined sides and its lateral faces and the meeting surface describing a centrally symmetrical octagon, and the meeting surface together with the end face and lateral faces of the stem being symmetrical about the center of the stem. The head may describe a regular octagon. The stem may describe a square. But the stem may also describe a circle. The elements can be laid to form a composite ground covering structure, laid e.g. in herringbone bond pattern, and laid e.g. to include one or more supplementing slab elements of the same peripheral configuration as the stems of the elements.

    Crystal oscillator and a signal oscillation method thereof
    7.
    发明申请
    Crystal oscillator and a signal oscillation method thereof 失效
    晶体振荡器及其信号振荡方法

    公开(公告)号：US20020101290A1

    公开(公告)日：2002-08-01

    申请号：US10054281

    申请日：2002-01-22

    申请人： NIHON DEMPA KOGYO CO., LTD.

    发明人： Takeo Oita

    IPC分类号： H03L001/00

    CPC分类号： H03B7/04 ,  H03B5/32

    摘要： A crystal oscillator according to the present invention prevents abnormal oscillation at a temperature in a low-temperature area equal to or lower than an ordinary temperature. The crystal oscillator is configured such that a crystal vibrator is made to abut against a heat source, and the temperature of the crystal vibrator can be kept higher than a temperature where abnormal oscillation occurs. The temperature of the crystal vibrator is assumed to be, for example, higher than 0null C. Additionally, as the heat source, for example, a power transistor that amplifies an oscillation output is used.

    摘要翻译： 根据本发明的晶体振荡器防止在等于或低于常温的低温区域的温度下的异常振荡。 晶体振荡器被配置为使得晶体振子与热源抵接，并且晶体振子的温度可以保持高于发生异常振荡的温度。 假设晶体振子的温度例如高于0℃。此外，作为热源，例如使用放大振荡输出的功率晶体管。